Beidou PPP-RTK-based low earth orbit satellite space-time reference establishment method

Abstract

The invention provides a Beidou PPP-RTK-based low earth orbit satellite space-time reference establishment method. According to the method, an observation equation is established by fully utilizing various error correction information broadcasted by Beidou PPP-RTK service, a navigation satellite precision orbit and a clock difference product; and a low earth orbit satellite space-time reference issolved by adopting a Kalman filtering parameter estimation strategy. Compared with an existing method, the method effectively avoids precision loss caused by resolving the space-time reference of a low earth orbit satellite by only adopting a navigation satellite orbit introduced by broadcast ephemeris and clock error precision difference, and also avoids precision loss caused by the fact that asatellite-borne receiver clock error absorbs various deviation items which are not accurately modeled; and the method has remarkable characteristics and advantages compared with a traditional low-orbit satellite orbit determination and time service method.

Description

technical field [0001] The invention belongs to the fields of satellite navigation, radio wave propagation and precise orbit determination, and in particular relates to a method for establishing a low-orbit satellite time-space reference based on Beidou PPP-RTK. Background technique [0002] Low-orbit satellites (LEO) are a platform for the future integration of navigation, communication, and remote sensing, and play a vital role in it. First of all, low-orbit satellites serve as space nodes; uplinks receive signals from Global Navigation Satellite System (GNSS) such as GPS and BDS, and downlinks serve ground users; meanwhile, low-orbit satellites also play a role in supporting future space-ground integration. effect. Under the new trend of aerospace information development, new requirements are put forward for low-orbit satellites; mainly including new requirements such as enhanced positioning of low-orbit satellites in the future, 6G communication of low-orbit satellites,...

AI Technical Summary

Problems solved by technology

Firstly because: navigation and positioning users, communication users, and intelligent remote sensing users need real-time services; secondly because: low-orbit satellites enhance precision positioning, and centimeter-level realization of earth observation platforms require high-precision services; finally because; future applications will be popularized and low-orbit The number of satellites is huge, and large-scale services need to be provided; however, the existing real-time low-orbit satellite space-time references do not meet the above requirements: most of them are analyzed and studied with post-event data from satellite-borne receivers. Although the accuracy is high, they cannot meet the requirements. real time demand

There are also some studies based on real-time orbit determination of low-orbit satellites based on broadcast ephemeris, but the accuracy is mostly sub-meter level, which cannot meet the high-precision requirements

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